San Mateo is a city located in California. With a 2020 population of 103,520, it is the 69th largest city in California and the 304th largest city in the United States. San Mateo is currently declining at a rate of -0.44% annually but its population has increased by 6.49% since the most recent census, which recorded a population of 97,207 in 2010. San Mateo reached it's highest population of 104,885 in 2018. Spanning over 16 miles, San Mateo has a population density of 8,505 people per square mile.
The average household income in San Mateo is $165,420 with a poverty rate of 7.55%. The median rental costs in recent years comes to $2,475 per month, and the median house value is $1.10 Mn. The median age in San Mateo is 38.2 years, 36.5 years for males, and 40 years for females. For every 100 females there are 99.9 males.